NHL Players' Association Files Grievance Over Concussion Protocols In a move that could have significant implications for the future of player safety in the National Hockey League, the NHL Players' Association (NHLPA) has filed a grievance against the league over its concussion protocols. The grievance, which was announced in a statement, comes after a recent incident involving a player who was cleared to return to play despite showing symptoms of a concussion. The NHLPA is seeking to have the league's concussion protocols reviewed and potentially revised to better protect players from head injuries. The move is the latest development in the ongoing debate over player safety in the NHL.